rpms/python3.14
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Use prebuilt JIT stencils on platforms without LLVM 19

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(cherry picked from python3.15 commit f3045380bba4fd8047571a76b233c5d955eb2577)
This commit is contained in:
Miro Hrončok 2025-03-27 12:08:00 +00:00
commit 2986781bf7
5 changed files with 76 additions and 4 deletions
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49
python3.14.spec
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@ -78,10 +78,13 @@ License: Python-2.0.1
# PEP 744: JIT Compilation
# Whether to build with the experimental JIT compiler
# We can only have this on Fedora 41+, where clang 19+ is available
# And only on certain architectures: https://peps.python.org/pep-0744/#support
# Only possible on certain architectures: https://peps.python.org/pep-0744/#support
# The freethreading build (when enabled) does not support JIT yet
%bcond jit %[(0%{?fedora} >= 41) && ("%{_arch}" == "x86_64" || "%{_arch}" == "aarch64")]
%bcond jit %["%{_arch}" == "x86_64" || "%{_arch}" == "aarch64"]
# Whether to build the JIT stencils (or else use the prebuilt ones)
# We can only do this on Fedora 41+, where clang 19 is available
# We don't do it in RHEL, see https://github.com/fedora-eln/eln/issues/207
%bcond jit_build_stencils %[%{with jit} && 0%{?fedora} >= 41]
%if %{with jit}
# When built with JIT, it still needs to be enabled on runtime via PYTHON_JIT=1
%global jit_flag --enable-experimental-jit=yes-off
@ -293,7 +296,7 @@ BuildRequires: glibc-all-langpacks
BuildRequires: tzdata
%endif
%if %{with jit}
%if %{with jit_build_stencils}
BuildRequires: clang(major) = 19
BuildRequires: llvm(major) = 19
%endif
@ -347,6 +350,24 @@ Source10: idle3.desktop
# AppData file for idle3
Source11: idle3.appdata.xml
# Pre-generated JIT stencils (see PEP 774)
# As the PEP was deferred, we use stencils we built for ourselves.
# Only used on platforms without the required LLVM version.
#
# When updating Python:
# 1. touch the .h files (create them empty)
# 2. scratch build Python on platform with required LLVM version (usually rawhide)
# 3. download the files from Koji:
# $ bash download-jit-stencils-from-koji.sh KOJI_TASK_URL|KOJI_TASK_ID
# 4. add the files to lookaside cache with fedpkg new-sources
Source30: download-jit-stencils-from-koji.sh
Source31: Python-%{upstream_version}-aarch64-debug-jit_stencils.h
Source32: Python-%{upstream_version}-aarch64-optimized-jit_stencils.h
Source33: Python-%{upstream_version}-x86_64-debug-jit_stencils.h
Source34: Python-%{upstream_version}-x86_64-optimized-jit_stencils.h
%global jit_stencils_source %{_sourcedir}/Python-%{upstream_version}-%{_arch}-${ConfName}-jit_stencils.h
%global jit_stencils_filename jit_stencils-%{_arch}-redhat-linux-gnu.h
# (Patches taken from github.com/fedora-python/cpython)
# 00251 # 5ac6e7781923cbb3e4606e3bca381a1167d322e5
@ -1045,6 +1066,16 @@ BuildPython() {
$ExtraConfigArgs \
%{nil}
%if %{with jit} && %{without jit_build_stencils}
if [[ ! "$ConfName" =~ ^freethreading ]]; then
cp -a %{jit_stencils_source} %{jit_stencils_filename}
# Hackish way of preventing PGO task to delete the stencils.
# Upstream issue: https://github.com/python/cpython/issues/141808
# Upstream PR: https://github.com/python/cpython/pull/141809
sed -i '/rm -f jit_stencils.h/d' Makefile
fi
%endif
%global flags_override EXTRA_CFLAGS="$MoreCFlags" CFLAGS_NODIST="$CFLAGS_NODIST $MoreCFlags"
%if %{without bootstrap}
@ -1397,6 +1428,16 @@ for Module in %{buildroot}/%{dynload_dir}/*.so ; do
esac
done
# Assert the pre-generated JIT stencils are up to date
%if %{with jit_build_stencils}
for ConfName in %{?with_debug_build:debug} optimized; do
if [ -s %{jit_stencils_source} ]; then
diff -u %{jit_stencils_source} build/${ConfName}/%{jit_stencils_filename}
else
echo "%{jit_stencils_source} is empty, not checking if it is up to date"
fi
done
%endif
# ======================================================
# Running the upstream test suite